#define SPTPS_SIG 3 // Waiting for a SIGnature record
#define SPTPS_ACK 4 // Waiting for an ACKnowledgement record
+// Overhead for datagrams
+#define SPTPS_DATAGRAM_OVERHEAD 21
+
typedef bool (*send_data_t)(void *handle, uint8_t type, const char *data, size_t len);
typedef bool (*receive_record_t)(void *handle, uint8_t type, const char *data, uint16_t len);